>>25041855Put the puppet you want to reincarnate in the first slot, then the two you want to pass the IVs from in the second two. Pick which mark you want and the rainbow stone. Spend one magical fragment.
Done. No waiting for eggs or hatching said eggs, you just get your results immediately and can try again immediately. It'll take a good chunk of time to get your first all-S rank unless you get lucky, but once you do getting good puppets becomes a complete joke.
When I next play Pokemon again, it's going to be a nightmare going back to regular breeding because of how much better this is.